In Domoticz you can add cameras that you can use to take snapshots when an event happens.
To add a Camera to Domoticz go to 'Setup -> More Options -> Camera' and press the blue button 'Add Camera'
The basic setup exists of:
IP address: the address of the dbell (e.g. 192.168.1.25)
Port: the port of the dbell (e.g. 81)
Username: <username of the dbell>(admin123)
Password: <password of the dbell>(password123)